Internal combustion engine, more particularly for the propulsion of vehicles



1933. C.SCHAER 1,896,852

' INTERNAL COMBUSTION ENGINE, MORE PARTICULARLY FOR THE PROPULSION OFVEHICLES Filed Aug. 21, 1931 9Q I v d 15 I N\/E NT El Pg; haMeSSK/W;

HIS/ S Patented Feb. 7, 1933 UNITED STATES PATENT OFFICE CHARLES semen,or LANGENTHAL, SWITZERLAND, .assrenon T FIRM SULZEB FBERES soornrnANONYME, or WINTEBTHUR, SWITZERLAND INTERNAL COMBUSTION ENGINE, MOREPARTICULARLY FOR THE PROPULSION 0F VEHICLES -Application filed August21, 1931, Serial No. 558,480, and in Switzerland August 30, 1930.

This invention relates to a control system for an internal combustionengine of the type provided with an electric starting motor and anelectrically driven pump for circulating cooling medium through theengine, and having means such as a throttle or injection de vice forcontrolling the fuel supply to the engine.

According to the invention there is provided, for use with such anengine, a control system comprising connections between the means forcontrolling the fuel supply to the engine and the switches controllingthe starting motor and the motor for the pump for supplying coolingmedium, such connections being so arranged that upon operation of thestarting motor the pump motor is switched on, and can thereafter only beswitched off simultaneously with or subsequently to the cutting off ofthe fuel supply.

Preferably a further independent switch is provided for switching offthe pump motor at any time, and in such a case the arrangement is suchthat operation of said independent switch to switch off the pump motorcuts off the supply of fuel to the engine.

A convenient embodiment of the invention is illustrated by way ofexample in the accompanying diagram.

In this example the storage battery 1 supplies energy for driving themotor 2. of the pump 50 for delivering cooling medium to the internalcombustion engine 21 through the conduit 52. The circuit of the pumpmotor 2 can be closed and opened either by the automatically controlledswitch 5 or by the independent hand-operated switch 6. The startingmotor 19 of'the internal combustion engine 51,which may of course, whennot acting as a motor act as a generator in the known way, is suppliedwith energy from the battery 1 through wires 21 and 42, switch 8 andwires 7 and 43, although'of course another source of energy separatefrom the battery 1 may supply the current for this purpose.

The lever 9 regulates the charge delivered I by the fuel pump 53 of theengine 51, which in the present example is of the compression ignitiontype. The lever 9 is adapted to be moved through the coaction of the rod54, lever 55, and lever 56, by means of the servomotor piston 11 whichslides in the cylinder 10, and is controlled in such a manner that itassumes the one position a for the starting and the running of theengine and the position b for stopping the engine. The ad mission of apressure transmitting fluid to cylinder is controlled by a slide valve14 in such a manner that the pressure transmitting fluid enters cylinder10 through either pipe 12 or pipe 13, so that the piston 11 is movedeither to position a or position b. The pressure transmitting fluidenters the chest of the valve 14 through the pipe 15 and can escape fromeither end of the cylinder 10, according to the position of the slidevalve 14, through port 16. V

The switch 5 controlling the motor for I driving the cooling water pump,the switch 8 controlling the starting motor, and the slide valve 14 forthe servo-motor piston 11 controlling the fuel supply to the engine arerendered interdependent with respect to their operation by being jointlycontrolled by a drum controller 17 in such a manner that beforeoperation of the starting motor 19 the pump motor 2 is switched on, andcan thereafter only be switched off simultaneously with or subsequentlyto the cutting off of the fuel supply to the engine, as by servomotorpiston 11. To this end the controller 17, can be brought by means oflever 18 into four different positions 0, P, Q and R. In the position 0,none of the six contacts A, B, C, D, E and F is electrically connectedto another, so that no current can pass through any of the controlmagnets 20, 21, 22 and 23 controlling switches 5 and 35, 39 and 8 andvalve 14. The switches are in the position shown in the drawing, and thelever 57 is in its extreme lefthand position. In this position of thecontrol system, the circuit through the pump motor 2 and the circuitthrough the starting motor 19 are open, so that both motors areinoperative.

When it is desired to start the engine, the drum switch or controller 17is moved into the position P in which the three contacts 0, D and E areelectrically connected together by means of the drum segment 24, so thatcurrent'will pass through the wires 27,

'28, 29 and 30 and the contact E to sliding contacts C and D.

The controlcurrent from the contact 1) passes through wire 31 to thecontrol magnet 20 of the switch 5 whereby the latter will be closed andthe pump motor started. The current from contact 0 passes through Wire32 to the control magnet 22 which thereupon moves the slide valve intothe extreme righthand position.

Thereupon the pressure transmitting fluid lever 9 is moved to theposition (1, thereby putting the fuel injection device of the engineinto proper position for operation.

If now the ,drum controller 17 is moved farther to the position Q, thecontacts A and B, hitherto isolated, will be connected together, wherebycurrent will pass via wire 27 contacts A and B anddrum segment 25.. andwire 33 to the control magnet 21, which thereupon closes switch 8 andenables the starting motor 19 to be energized to start the engine 51.

When the engine commences to fire and starts up under its own power, thedrum switch 17 can be returned to the position 0 thereby breaking allmutual connections between the contacts A, B, C, D, E and F.

As, however, during starting of the engine the switch 5 was closed,thereby connecting wire 34 to wire 36 by the switch blade35, the switch5 will remain closed as the circuit through its control magnet 20 is nowcompleted through wires 28, 29, 34 and 36. On

the other hand the control circuit of the starting motor 19 is nowbroken so that the magnet 21 of the starting motor switch 8 isdeenergized, and switch 8 therefore opens. In order to stop the enginethe drum switch 17 is moved into position R, thereby connecting togetherthe contacts E and F by segment 26. By this operation connection ismade, through wires 30 and 37, to the'slide valve control magnet 23which therefore moves the slide valve 14 to the extreme lefthandposition and consequently moves the servo-motor piston 11 into itslowest position b in which the fuel supply is cut off from theeng1ne,'which therefore stops, At the same time however, the circuit tothe pump motor 2 is still unbroken because the circuit through the wire34, contact plate 35, wire 36, and the solenoid 20, isstill unbroken, sothat the meme \ mally spring-urged into the closed position,

is pressed upon, thereby breaking the circuit to the control magnet 20and opening switch 5.

In the event of a premature depression of independent switch 38, or ofany other interruption of the circuit to the control magnet 20of thepump motor switch 5, opening of switch 5 brings the switch blade 39 intothe closed position whereby connection is made through wires 40, 41 and37 to the control magnet 23 which moves slide valve 14 into the extremelefthan-d position, thereby moving the servo-motor piston 11 intoposition b and stopping the engine as previously described,

The circuit through the pump motor 2 can be closed at any time by theswitch 6 when the automatically controlled system is for some reason outof order, whereby operation of the pump is ensured during the time thatnever be running without efficient cooling,

and damage due to over-heating and caused by carelessness is thereforeobviated.

I claim;

1. A control system for an internal combustion engine having a fuelinjection device, a starting motor and switch, a cooling water pump andmotor and switch. and means for controlling the supply of fuel to theengine, comprising connections between the means for controlling thefuel supply to the engine and the switch controlling the starting motorand the switch controlling the pump motor, and means in said connectionwhereby the pump motor is switched on before the starting motor and canthereafter be switched off only simultaneously with'or subsequently tocutting off the fuel supply.

2. A control system for an internal com-' bustion engine having a fuelinjection device, a starting motor and switch, a cooling water pump andmotor andswitch, and means for controllingthe supply of fuel to theengine, comprising in combination controlling means arrangedcbetween theswitch for the motor of the cooling water pump, the switchof thestarting motor and the fuel injection device,

neeaeee means for automatically switching on the cooling water pump uponstarting the said internal combustion engine and means for causing thecooling water pump to continue its operation after the said internalcomhustion engine is stopped,

3. A control system for an internal combustion engine having a fuelinjection device, a starting motor and switch, a cooling water pump andmotor and switch, and means for controlling the supply of fuel to theengine, comprising in combination controlling means arranged between theswitch for the motor of the cooling water pump, the switch of thestarting motor and the fuel injection device, means for automaticallyswitching on the cooling water pump upon starting the engine, means forcausing the cooling water pump to continue its operation after theengine is stopped, and means for automatically interrupting'the fuelsupply to the engine during the running of the latter, when the miptorof the cooling water pump is switched o s 4. A control system for aninternal combustion engine having a fuel injection device, a startingmotor and switch, a cooling water pump and motor and switch, and meansfor controlling the supply of fuel to the engine, comprisin incombination controlling means arranged Tactween the switch for the motorof the cooling water pump, the switch of the starting motor and the fuelinjection device and means for automatically interrupting the fuelsupply to the engine-during the running of the latter, when the motor ofthe cooling water pump is switched off.

5. A control system for an internal combustion engine having a fuelinjection device, a starting motor and switch, a cooling water pump andmotor and switch, and means for controlling the supply of fuel to theengine, comprising in combination controlling means arranged between theswitch for the motor of the cooling water pump, the switch of thestarting motor and the fuel injection device and a bridging switch saidswitch being arranged in parallel with the switch controlled by saidmeans, in the circuitof the motor for the cooling water pump.

In testimony whereof I have aflixed my signature.

CHARLES SGHAER.

